Easiest way to prettify PM is to use the Perl-Blue Theme (via your Display Settings).

I have also taken advantage of CSS code some Monks have posted:

/* Override inline-list CSS */
li.inline,        .inline-list li { display: inline; margin-left: 0pt;
+ }
li.inline:before, .inline-list li:before  { content: ""    }
li.inline:after,  .inline-list li:after   { content: ","   }
ul.inline-list { display: inline; margin: 0; padding: 0; list-style: n
+one; }

/* Increase size of text input areas. */
textarea { width: 100%; height: 25em; }
table.user-settings, 
.user-settings textarea { width: 100%; }
[download]

And ditto for Javascript via my Free Nodelet Settings:

<script type="text/javascript">
// Move nodelets to the left side.
function move_nodelets_to_left() {
   var td = document.getElementById('nodelet_container').parentNode;
   var tr = td.parentNode;
   tr.insertBefore(td, tr.firstChild);
   }

// Execute our snippets after the page is parsed.
var old_onload = window.onload;
window.onload = function() {
   if (old_onload != null)
      old_onload();

   move_nodelets_to_left();
   };
</script>
[download]

With these, PM looks pretty good (not necessarily great or modern, but having a more classic look is fine by me).